Swagelok Company    Solon, OH 44139-3492
May 25, 2011 Used to proportionally vent overpressure, RHPS series PRV model offers NPT female, BSPP female, and BSPP male end connections in ¼, ½, ¾, and 1 in. sizes. Available threaded adapters convert from BSPP to NPT to facilitate product installation. Offering smooth operation, valve has balanced design unaffected by system back pressure up to 50% of valve's set pressure, which is offered in 5 ranges from 145-580 to 4,060-5,800 psig. Flow coefficients (Cv) range from 0.49-4.36.

Groth Corp.    Stafford, TX 77477
Jul 16, 2009 Available in 2 in. (DN 50) through 12 in. (DN 300) flange sizes, 1800 A series full lift type valve is suited for applications requiring low emissions and operation near tank maximum allowable working pressure (MAWP). Modulating valve offers near zero blowdown and reseats at near set pressure, while reducing breathing losses of product in tank.

Lee Company, The    Westbrook, CT 06498 0424
Feb 03, 2009 Weighing only 20 g, Series 375 High Pressure PRI relief valve offers wide range of cracking pressures for 3,000, 4,000 and 5,000 psi systems with system peak pressures up to 6,750 psi. Features included are tungsten carbide ball and 440C CRES seat.

Apollo Valves    Matthews, NC 28105
Sep 30, 2008 With modular check valve design, RP 4A Series reduced pressure principle backflow preventers can fit in tight spaces and under small enclosures. They have 4 top-mounted test cocks and 2 removable captured spring check modules which are independently accessible from top and can be replaced or disassembled for ease of maintenance. Featuring corrosion resistant all-bronze body, units offer maximum working pressure of 175 psi and operating temperature range of 33-140°F.

Maxpro Technologies    Fairview, PA 16415
Mar 26, 2008 Suited for both gas and liquid applications, externally adjustable MT10RV Series protects systems and components against over-pressure. Poppet design allows for chatter-free pressure release and optimal deadband pressure control, while soft seat design provides bubble tight shut-off.

Parker Hannifin Corp., Partek Instrumentation Group    Cleveland, OH 44124
Feb 26, 2008 Available with 0.142 in. flow ports, HPRV, PED-certified valve features captured seat design that is blow-out and chip-resistant, as well as balanced poppet design for operation in back pressures up to 2,000 psig. Range of color-coded springs configure valve for 8 cracking pressure ranges, and fine adjustment is achieved by external nut secured by Tru-Loc mechanism and lock wire. O-ring seals adapt valve for use with different types of media over temperatures from -70 to +400°F.

Air Logic, Div. Fred Knapp Engraving Co., Inc.    Racine, WI 53402
Feb 14, 2008 Designed for precise control in pneumatic circuits, Model R-6100 can be used as relay valve to sequence specific signal operation, or as relief valve to limit pressure. Fixed or adjustable pressure settings are available. To adjust valve, user turns adjusting screw clockwise to reach zero adjustment, then turns adjusting screw counterclockwise to desired relieving or sequencing pressure.

Tyco International (US) Inc.    Princeton, NJ 08540
Jun 14, 2007 Certified under requirements of ASME Code Section I, pilot-operated Series 1500 is designed specifically for overpressure protection of economizers in fossil-fired power plants. All-plastic, soft seat valve operates as non-flowing modulating pilot, opens in proportion to relief demand, and is suitable for hot water, flashing water, and steam service. With no elastomer seats or seals, unit handles temperatures from -65 to 515°F and set pressure range of 15-6,170 psig.

CIRCOR Tech    Spartanburg, SC 29305
Jun 01, 2005 Series R6000 includes low-pressure models from 5–550 psig and high-pressure versions from 150–6,000 psig. Both feature raised seal lip that minimizes contact with seat, eliminating friction and preventing O-ring overstressing. Frictionless poppets ensure consistency of cracking and reseat pressures. High-pressure models are equipped with Delta stem seal, while low-pressure models have encapsulated seat seal. Orifice sizes include 0.082, 0.094, and 0.188 in.

Sauer-Danfoss    Ames, IA 50010
May 10, 2005 Normally closed, electro-proportional Model PRV controls pressure proportional to valve input signal, allowing operator to control pressure in hydraulic systems. Rated for pressures to 3,600 psi, unit fits 10-2 and 12-2 cavities with flow capability of 21 and 50 gpm, respectively. Four-way, 3-position Model PSV controls output flow proportional to electrical input. Rated for flows from 0-5.7 gpm, unit fits 10-4 cavity and handles pressures to 3,600 psi.

Spence Engineering Co., Inc.    Walden, NY 12586-0230
Feb 01, 2005 Safety Relief Valves are available in cast iron, bronze, stainless steel, and aluminum in sizes from ½ x ¾ in. to 6 x 8 in., for pressures up to 900 psig. Rugged construction and dual ring control provide dependable pop action, seat tightness, and repeatability. Valves meet ASME Sections I, IV, and VIII, API 527, and are also PED and TUV certified. Applications include steam boilers, pressure reducing stations, pumps, tanks, and cryogenic systems.

Asahi/America    Malden, MA 02148
Dec 16, 2004 Designed with PTFE bellows stem seal, Type E Pressure Relief Valve is available with PVC, PP, PVDF, or PTFE body materials and EPDM, FKM, or PTFE encapsulated FKM o-ring seals. Valve, available in ½â€“4 in. sizes, has no metal-to-media contact and is corrosion-resistant. Drilled to ANSI B16.5 bolt pattern, product can be installed in thermoplastic piping and metal pipelines. It is suited for use in chemical processing and wastewater treatment.

Plast-O-Matic Valves Inc.    Cedar Grove, NJ 07009
Aug 09, 2004 Teflon® Diaphragm Relief Valve features thermoplastic body with intrinsic flange, eliminating piping nipples and other threaded connections. Teflon® diaphragm and plastic body combine to provide non-leaching, contamination-free relief/by-pass valve. Flange connections are available in Teflon® PTFE, Kynar PVDF, and natural, unpigmented polypropylene.

Spence Engineering Co., Inc.    Walden, NY 12586-0230
Jul 21, 2004 Figure 31 Bronze Series meets ASME Section I and VIII Code for steam, air, and nonhazardous gas service. Available in sizes ½ x ¾ in. through 2½ x 2½ in., for temperatures from –20 to +406°F saturated steam, valves are top guided with full nozzle for optimum flow. They feature unitized bonnet/base design and dual ring control. Single cap and lifting lever permits manual valve opening, for testing with little force required.

Rockwood Swendeman, A Circor Cryogenics Co.    Walden, NY 12586-2035
May 14, 2004 Series RXSO Valves feature bronze body, in ½â€“2 in. sizes, which is suitable for pressures to 400 psig and temperatures from -423 to +400°F. Teflon® seat creates API 527 spec bubble-tight seal at over 90% of set pressure, meets ASME Code Section VIII, and is TÃœV and PED certified. Applications include stationary cryogenic storage tanks, dual safety relief systems, and air and gas compressors for overpressure relief of tanks, pipelines, and pumps.

Wanner Engineering, Inc.    Minneapolis, MN 55403
May 04, 2004 Series C46 valve prevents excess system pressure by bypassing total system fluid flow. Valve consists of tapered plunger and valve seat, has no external springs or moving parts, is fully adjustable, and can be serviced in place without removing fittings or plumbing. Available with SS or brass body, valve can handle flow up to 10 gpm and pressure up to 1,500 psi.

Spence Engineering Co., Inc.    Walden, NY 12586-0230
Mar 16, 2004 Available in 7 sizes from ¾ x 1 in. to 3 x 3 in., Figure 15V Series protects equipment such as blowers, compressors, pneumatic conveying equipment, and dryers. Non-ASME Code, cast iron valve series is rated for pressures from 5–30 Hg and temperatures from –20 to +400°F. It features tight shutoff, sharp popping and closing action, and integral inlet and body casting that assure proper alignment of disc, seat, and spindle.

Spirax Sarco, Inc.    Blythewood, SC 29016
Oct 10, 2003 Series 211 and 632 Safety Valves provide over-pressure protection in air or gas compressors, pressure vessels, piping, boilers, and cleaners. Disc, seat, and stainless steel spring provide bubble-tight seal. Certified for ASME Section I or Section VIII Code applications, valves serve operating pressure from 5–250 psi, with 250 psig max set pressure at 406°F. Relief performance is 39-7,810 scfm for air, gas, or vapor; 111-22,148 lb/hr for steam; and 9-478 gpm for liquid.

Circle Seal Controls, Inc.    Corona, CA 92880
Sep 25, 2003 Series R6000 Right Angle Relief Valves have fully encapsulated seat seal, which prevents inaccurate cracking pressures. Delta stem seal system reduces stem friction to produce accurate reseal, and raised lip on poppet prevents damage to O-ring. Valves are manufactured to meet OEM industrial application requirements.

Spence Engineering Co., Inc.    Walden, NY 12586-0230
Jun 09, 2003 Figure 860 meets ASME Section VIII for liquid, steam, air, and gas services and is PED compliant. Fixed ring design is constructed of 316 stainless steel (including internals) for corrosion resistance, and soft seat option provides tight shutoff for applications when operating pressure is close to set pressure of valve. Product, available in pressures to 900 psig and temperatures to 422°F, is also suited for cryogenic applications down to -400°F.